I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
gouache gauche cache coach couch gaucho quiche gotcha quaich gush gosh gash catch cooch cutch gushy quash cachou cashew catchy quitch
gouache ache bouchee vouchee cache gauche quaich quiche louche mache nuchae rouche ruche douche tache touche